Besides being a great philosopher, theologian, jurisprudent, mathematician, and astronomer and producing a number of valuable works, Khwājeh Nasir al-Din Tusi has marked a niche for himself in the history of Iran as one of the key personalities in the process of reviving the Iranian culture and transferring it to the next generation. By convincing Khurshāh to surrender to Hulāgu - which also marked the end of the Esmāili rule in Alamut - Khwājeh Nasir caught the attention of Hulāgu and became his close companion and also managed to influence him and establish the Marāgheh school in order to pave the path for the continuation of the Iranian culture, in general, and theology and philosophy, in particular. As described by Jurji Zaydan, Khwājeh Nasir was a shining light in the midst of a dark night. From the scholarly point of view, Khwājeh had a multi-dimensional personality. In the filed of theology he is renowned for his famous book, the “Tajrid al-Aqā’ed”, in which he introduced philosophy into theology, and for the first time in the course of history, exerted to prove the validity of the basic principles of the Ithnā Ashari Shiite faith on the basis of intellectual reasoning, in this way laying the grounds for strengthening them. The impact of Khwājeh Nasir on theology was so profound – particularly through his book the “Tajrid al-Aqā’ed” – that it would not be an exaggeration to consider the 7th and 8th Centuries AH/13th and 14th Centuries AD and even the 9th Century AH/15th Century AD as the age of Khwājeh Nasir and his students, particularly Allāmeh Helli, from the theological point of view. The other great scholars and thinkers associated with the Marāgheh and Tabriz school included Athir al-Din Abhari (d. c. 663 AH/1265 AD), Kātebi Qazvini (d. 675 AH/1276 AD), Qotb al-Din Shirāzi (d. 710 AH/1310 AD), and Qotb al-Din Rāzi (d. 76 AH/1374 AD).